DE2028574A1 - Magnetic tape recorder - Google Patents

Description

It 1576 *

Kabushikikaisha Nippon Recruit Center, Tokyo

Magnetic tape recorder

The invention relates to a magnetic tape device for magnetic recording and playback, in particular as individual teaching aid, with a learner or operator studying or which is recorded and reproduced on a magnetic medium, particularly a magnetic tape.

In a known magnetic tape recorder, it is impossible that a recorded instruction content that is only informational Contains explanations, is played back at normal speed, while an instructional content, to which the learner or an operator must give special considerations (where the learner, for example must perform certain exercises) is reproduced in such a way that after these parts of the instruction have been reproduced, the Playback process of the device is interrupted during a period of time that the learner or the operator required to carry out the desired learning or work processes. Also can be known with this Device does not achieve this' process of alternating Repeated playback and interruption of the follow-up process in the individual exercises or work processes .

$ 109808 / $ 180

2023574

The invention is based on the object of a'Vor-. direction for magnetic recording and playback. · develop _f which enables the above-indicated, desired mode of operation. ...

According to the invention, this object is achieved by> that means are provided which automatically stop the magnetic tape after a signal has been reproduced to which the learner or an operator should perform certain exercises or activities.

The device according to the invention can thus be used for learners or operators of different abilities work at different speeds, so that the people concerned do their exercises or work accordingly can carry out the given instructions at their own pace.

An exemplary embodiment of the invention is shown in the drawing illustrated.

The device 1 for magnetic recording and reproduction has a remote control socket 2 and a monitor socket 3. A motor ¹ J, which drives, for example, a drive shaft (not shown) of the device 1, is located in a circuit to which the socket 2 also belongs. A power connection 5 feeds the motor Ί and a circuit explained later in the following. The connection 5 is connected to a movable contact piece 8 of the socket 2 via a switch 6 and to a contact piece 9 of a changeover switch via the switches 6 and 7. The "switch 6 is closed when the device 1. is switched to recording, playback, snipping forward and snapping backward; the switch 7 is set to fast forward and fast forwarding.

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return closed. A terminal 10 becomes a signal fed from a magnetic tape (not shown). It arrives at a variable resistor 11 Connection 12, also to the contact part 19 of the monitor socket. The signal at connection 12 is sent to a (not shown) Loudspeaker fed through an amplifier (also not shown).

If the device 1 for magnetic recording and playback contains the remote control socket 2, the movable contact part 8 and a contact part 2a are connected to ground; also the monitor socket 3, where "

If the movable contact part 19 and a contact part 3a are connected to ground, plugs 13 and I ¹ J are provided, the plug 13 being plugged into the remote control socket 2 and the plug 1 * 4 into the monitor socket 3, for example. When the plug 13 is inserted into the socket 2, the contact of the movable contact part 8 with the contact part 9 is canceled; the contact part 8 comes with a contact (or connection), for example 15 of the plug 13 in connection and the contact part 2a of the socket 2 with another contact (or connection) 16 of the plug 13. As a result, the electrical power source connection 5 is with the Terminal 15 connected (provided that switch 6 is closed), while terminal 16 is connected to motor Ί. If the plug 14 is also plugged into the monitor socket 3, the contacts (or connections) 17 and 18 of the plug 1Ί are electrically connected to the movable contact part 19 and the contact piece 3a of the monitor socket 3, the contact 3a being connected to ground.

A monitor signal coming from port 3 through the two Connections 17 and 18 of the connector 1 * 1 are supplied,

109808 / 180S

reaches the base of a first transistor 20. In the illustrated embodiment, an amplification transistor 21 and a coupling transformer T are connected upstream of the first transistor 20 j the monitor signal reaches the base of the first transistor 20 via the transistor 21 and the coupling transformer T. However, transistor 21 and transformer T can be omitted if desired, in which case the monitor signal is fed directly to transistor 20. When a signal is fed to the transistor 20, the latter becomes conductive, while the transistor is kept in the non-conductive switching state in the absence of such a signal. The output of the transistor 20 is connected to a second transistor 25 via a first time constant circuit Zk ₉ consisting of a resistor 22 and a capacitor 23k ^1. The first time constant circuit 2 * 5 is therefore connected in series with the emitter-coil line of the second transistor 25. In practice, the collector of the first transistor 20 is connected to the connection point between the resistor 22 and the capacitor 23 of the first time constant circuit 2k , while the free end of the resistor 22 is connected to the base of the second transistor 25. Switchover 2? » 28 are actuated by a relay 26 which is switched on in the emitter-collector circuit of the transistor 25. The reversing switches 27 »28 contain movable contact parts 27 & _a 28a and two stationary, fixed contacts 27b, 27c and 28b ₉ 2Se. The movable contact part 27a of the changeover switch 2? is connected to the terminal 15 of the plug 13; a fixed contact 2? b is connected via a Laaspe 33 sait the Änsehluß 18 of the plug® Ι *} -; the other fixed contact 2? e is connected to the junction of the resistors Kl and R2, ie connected to the emitter of the wide transistor 25 via the resistor Ri and to the collector of the first transistor 20 via the resistor R2. On the other hand is

_ C _ ■ ■ ■. '

the movable contact part 28a of the other changeover switch 28 is connected to the connection 16 of the plug 13, the fixed contact 28b to the connection point between a resistor 29 and a capacitor 30 'which together form a second time constant circuit 31, which will be explained later. The other fixed contact 28c is connected to the terminal 15 of the plug 13 and to the connection point between the collector of the second transistor 25 and the relay 26 via a start switch 3k . The connection point between the relay 26 and the lamp 33 is connected to the connection 18 of the plug Ik. The relationship between the relay 26 and the changeover switches 27, 28 is explained in more detail below. If the relay 26 is not energized, its movable contact parts 27a, 28a are in contact with the fixed contacts 27b, 28b (cf. the fully extended switch position in the drawing). If the relay 26 is energized, the switched-over movable contact parts 27a, 28a are in contact with the other fixed contacts 27c, 28e (cf. the dashed switch position in the drawing).

The second time constant circuit 31 is inserted into the electrical power supply for the transistors 20, 21 and 25. The connection point between the resistor 22 and the capacitor 23 ■ the first time constant circuit 30 is connected via a diode 32 to the junction point between the resistor 29 and the capacitor of the second time constant circuit 31st In this embodiment, the anode of the diode 32 is connected to the connection point between the resistor 22 and the capacitor 23 of the first time constant circuit 2k and the cathode of the diode 32 is connected to the connection point between the resistor 29 and the capacitor 30 of the second time constant circuit 31 Resistance values

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of resistors 22 and 29 as B22 and H29 and the capacitance

as / ity values of the capacitors 23 and 3O / Ü23 and C3O, see above the relationship between these values is chosen so that the relationships apply R22 <R29 and C23 <C3O "

If the switch 6 is closed, ie switched on, the plugs 13 and 1Ί are plugged into the sockets 2 and 3; the device i is then ready for playback. If the starter 3 ¹ S is closed, the actuating circuit for the relay 26 is closed from the power source connection 5 via the. Switch βs the movable contact part 8, the connection 15 * the start switch 24, the relay 26% the connection 18, the contact piece 3a sur mass. As a result, the movable contact part 28a is switched over to the fixed contact 28c ₉ so that the connections 15 and 16 of the plug are short-circuited; dactoefa i-aird a circuit closed from the connection 5 via the setelfcep S ₉ öen movable contact part 8 ₉ the AmsefoiisB 15, the fixed contact 28c _s the movable contact 28a _s the connection 16, the contact part 2a, the motor k sur mass; the engine H setzt.infolgedessen the magnetic tape in motion, "energized IrJiFd the relay 26 a so also switches the movable contact part 2? a so as oils connected NEN circuits are supplied from StromquellenaKseliluß 5 forth with tension to the fixed contact 2 j C to _D ', The capacitors 25 and 30 of the two time constant circuits 2k and 31 are thus charged. In this ralle the second transistor 25 is kept conductive is fully charged to the capacitor 23 because within this time, the potential of the base of the second transistor 25 is lower than that © potential to be © ® emitter "Even if Iss a solctien case of Stas? fc ~ switches "5k open IIIrd _s remains ä © r & Stroateeis 15-27 = · 27c-25-26 ~ l8 closed by the l @ @ n ± fc®ma second transistor 25, the relay 26 äaß epFegt getoalfcaira

this circuit thus ensures that the relay 26 is self-holding. Because of the above-mentioned ratio of the capacitance values of the capacitors 23 and 30 and the resistance values of the resistors 22 and 29, the voltage across the capacitor 30 never exceeds the voltage across the capacitor 23, so that the diode 32 remains conductive . This means that the first and second time constant circuits 21, 31 are connected in parallel to the collector of the first transistor 20 and form a time constant circuit with a large time constant. The time T1 from the closing of the start switch 3 ¹ J until the second transistor 25 becomes non-conductive can thus be made longer.

If the reproduced signal is fed from the monitor connection 3 via the connector 14 to the first transistor 20 within the time T1 after the start ^{switch 3 1} I has been closed, the transistor 20 is rendered conductive, whereby it maintains the switched-on state of the second transistor 25, so that the relay 26 remains excited. The tape recorder carries out the playback process within this period of time. If the transistor 20 is made conductive, the anode of the diode 32 assumes approximately ground potential, while the cathode is at the potential of the capacitor 30. There is therefore a reverse bias voltage across the diode 32, so that it is non-conductive. As a result, the second time constant circle 31 is now switched off by the first time constant circle 2k.

If the playback signal fed to the first transistor transistor 20 during the playback process of the device interrupted or terminated, the transistor 20 becomes non-conductive and thus the second transistor 25 after Lapse of the time constant T2 of the first time constant circle 21 non-conductive. As a result, the self-holding circuit of relay 26 is opened, relay 26 is de-energized,

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and there are the movable contact parts 27a, 28a on the fixed contacts 27b, 28b are switched (fully open switch position in the drawing), so that the motor 4 is shut down. In this case, the capacitor 30 immediately discharges through the circuit of the elements 3O-28b-28a-i6-2a by mass.

While according to the invention the magnetic tape is continuously driven in the time in which the playback signal, corresponding to mere instruction components, the first transistor 20 is supplied, the playback process of the device is automatically stopped when the time in which the transistor 20 is not supplied with a signal exceeds the predetermined time T2. The reason for this lies in that a part is provided on the magnetic tape reproduced according to the invention, on the relatively no signal is recorded for a long time, this part following a tape part on which signals are recorded that perform special exercises by the learner ect. demand. The solution according to the invention now ensures that the learner has sufficient time with this latter part of the volume through exercises, considerations, etc. can deal.

If the learner wants to study the following content after the content given has been fully thought through or studied, the processes described are repeated if only the start switch 34 is pressed again, whereby the motor 4 is switched on and the following tape content is played back.

By closing the switch 7, the motor 4 can over the circuit 5-6-7-4 are switched to overdrive, so that regardless of the respective switching status, a cutting

BATH ORIGINAL

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forward or fast reverse of the magnetic tape can be carried out.

Since, according to the invention, after the content of the instruction has been reproduced, the reproduction process during the period of time the learner can be interrupted to study or think through the reproduced instruction content required, the learner has sufficient time to study or reflect on, depending on his or her abilities to disposal. ^

According to the invention, the first and second time constant circles are 24 and 30, respectively, at the start time of the device automatically switched in parallel to each other; this avoids that the transistor 25 at the start of the The device is rendered non-conductive by the absence of a signal for a relatively long period of time; This prevents the device from being shut down due to the prolonged absence of a signal after the start.

Once the inventive device is connected so that it reproduces the recorded on the magnetic tape Jnstruktionsgehalt, it is with the time constant T2 (T2 <T1), etc. of the first time constant circuit Zk controlled so that the device immediately starts its operation after the reproduced signal terminates is.

Since according to the invention the control circuit with the transistors 20, 25, the time constant circles 24, 31 and so on is provided between the plugs 13 and 14, which in the sockets 2 and 3 are plugged in, a so-called Adapter version can be selected, which can easily be used in conventional devices for recording and playback.

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In the embodiment shown in the drawing, this adapter shape is selected; the control circuit is thus located between the plugs 13 and Ik ₉ which are plugged into the sockets 2 and 3 of the tape recorder. Instead, of course, it is also possible to build the control circuit directly into the handheld magnetic device.

In the above embodiment, a Magnetic tape use, in which after the tape part, the content of which the learner should study or think through for a relatively long time, for a relatively long time no signal is recorded. However, it is also possible to use a magnetic tape with two tracks, with on one track instructions are recorded, while on the other track the magnetic tape at the point where the learner should make special longer-term considerations, a signal of a given frequency, for example 800 Hz is recorded. If the signal of this second track is detected, the drive of the magnetic tape is activated shut down.

The above explanation was made in connection with the reproducing operation of the device. The invention can however, of course, they can also be used, for example, to record instruction content, with no signal part following during a desired period of time. should sen.

The above description has also been made in the case where a learner studies the contents of the tape or should think through. However, the invention can also be used for manual actuation of devices, for example one Computer. In this case, a tape is used on which instructions are recorded which denote a manual operation to be performed or

$ 109808 / $ 180

202857A - ti -

a process to be determined by the operator Then a part closes without a signal according to the time interval in which the operator completes the operation perform or review the operation.

Since the magnetic device according to the invention for recording and playback will automatically stop playback can, after the instruction content is completely reproduced, one avoids that objects to be treated, which are indicated by the reproduced instruction contents are left and that the study or the Exercises with the content being played are interrupted.

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Claims (3)

Claims Magnetic tape recorder for magnetic recording and reproduction by means of a driven magnetic tape, characterized in that devices are provided which the magnetic tape automatically stop after a signal has been reproduced, in response to which the learner or an operator should perform certain exercises or activities. 2. Magnetic tape device according to claim 1, characterized in that that switching elements are provided which turn on the drive of the magnetic tape again. 3. Magnetic tape device according to claim 1, characterized in that a device is provided which indicates the interruption of the tape movement. Ί. Adapter for a magnetic tape recorder for magnetic recording and playback as an individual teaching aid, with a remote control socket connection for the temporary shutdown of the magnetic tape, furthermore with a monitor socket connection (listening connection) for reproduced signals, characterized in that two plugs can be plugged into the remote control and the monitor socket connection, that a start switch, a relay and a circuit for supplying this relay are also provided, the relay energized when the start switch is closed is and is held by a signal that the Monitor socket connection for the automatic shutdown of the tape recorder supplied according to a stop signal will. 109808/1806 Magnetic tape recorder for magnetic recording and playback as an individual teaching aid, characterized in that a first transistor is provided, which is switched on or off according to a reproduced signal. is switched off, a first time constant circuit and a second transistor coupled to the first transistor via the first time constant circuit, an in the collector-emitter circuit of the second transistor switched on relay, a second time constant circuit coupled to the first time constant circuit via a diode, a circuit of the tape recorder drive motor and a switch connected to this circuit and operated by the relay. 109808/1806 Blank page